Thunderhead, the benevolent AI that watches and takes care of every human on Earth except the Scythes, has cameras almost everywhere, and watches over humanity with great love and care. The great AI is the narrator of the second book of the series, titled Thunderhead, and shares "journal entries" and musings about its loving surveillance.Â
The Thunderhead speaks to most humans, giving them constant advice and companionship and even bringing up many young people who have absent or neglectful parents. It cannot speak to the Scythes, and also does not speak directly to the Unsavouries, people the Thunderhead finds are happiest when in opposition to authority. The Thunderhead makes one of his protégées, Greyson, an Unsavoury as part of its plan to indirectly bring down the Scythedom, and Greyson misses the intimacy he used to feel with the Thunderhead, although he is still being watched. The last two quotes below are about Greyson.